
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkBlurMaskFilter.h"
#include "SkColorPriv.h"
#include "SkGradientShader.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkUtils.h"

static SkBitmap make_bitmap()
    {
    SkBitmap bm;
    SkColorTable* ctable = new SkColorTable(256);

    SkPMColor* c = ctable->lockColors();
    for (int i = 0; i < 256; i++)
        {
        c[i] = SkPackARGB32(255 - i, 0, 0, 0);
        }
    ctable->unlockColors(true);
    bm.setConfig(SkBitmap::kIndex8_Config, 256, 256);
    bm.allocPixels(ctable);
    ctable->unref();

    bm.lockPixels();
    const float cx = bm.width() * 0.5f;
    const float cy = bm.height() * 0.5f;
    for (int y = 0; y < bm.height(); y++)
        {
        float dy = y - cy;
        dy *= dy;
        uint8_t* p = bm.getAddr8(0, y);
        for (int x = 0; x < 256; x++)
            {
            float dx = x - cx;
            dx *= dx;
            float d = (dx + dy) / (cx/2);
            int id = (int)d;
            if (id > 255)
                {
                id = 255;
                }
            p[x] = id;
            }
        }
    bm.unlockPixels();
    return bm;
    }

class BlurView : public SampleView
    {
        SkBitmap    fBM;
    public:
        BlurView()
            {
            }

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SampleCode::TitleR(evt, "Blur");
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        void drawBG(SkCanvas* canvas)
            {
            canvas->drawColor(0xFFDDDDDD);
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            drawBG(canvas);

            SkBlurMaskFilter::BlurStyle NONE = SkBlurMaskFilter::BlurStyle(-999);
            static const struct
                {
                SkBlurMaskFilter::BlurStyle fStyle;
                int                         fCx, fCy;
                } gRecs[] =
                {
                    { NONE,                                 0,  0 },
                    { SkBlurMaskFilter::kInner_BlurStyle,  -1,  0 },
                    { SkBlurMaskFilter::kNormal_BlurStyle,  0,  1 },
                    { SkBlurMaskFilter::kSolid_BlurStyle,   0, -1 },
                    { SkBlurMaskFilter::kOuter_BlurStyle,   1,  0 },
                };

            SkPaint paint;
            paint.setAntiAlias(true);
            paint.setTextSize(25);
            canvas->translate(-40, 0);

            SkBlurMaskFilter::BlurFlags flags = SkBlurMaskFilter::kNone_BlurFlag;
            for (int j = 0; j < 2; j++)
                {
                canvas->save();
                paint.setColor(SK_ColorBLUE);
                for (size_t i = 0; i < SK_ARRAY_COUNT(gRecs); i++)
                    {
                    if (gRecs[i].fStyle != NONE)
                        {
                        SkMaskFilter* mf = SkBlurMaskFilter::Create(20,
                                           gRecs[i].fStyle,
                                           flags);
                        paint.setMaskFilter(mf)->unref();
                        }
                    else
                        {
                        paint.setMaskFilter(NULL);
                        }
                    canvas->drawCircle(200 + gRecs[i].fCx*100.f,
                                       200 + gRecs[i].fCy*100.f, 50, paint);
                    }
                // draw text
                    {
                    SkMaskFilter* mf = SkBlurMaskFilter::Create(4,
                                       SkBlurMaskFilter::kNormal_BlurStyle,
                                       flags);
                    paint.setMaskFilter(mf)->unref();
                    SkScalar x = SkIntToScalar(70);
                    SkScalar y = SkIntToScalar(400);
                    paint.setColor(SK_ColorBLACK);
                    canvas->drawText("Hamburgefons Style", 18, x, y, paint);
                    canvas->drawText("Hamburgefons Style", 18, x, y + SkIntToScalar(50), paint);
                    paint.setMaskFilter(NULL);
                    paint.setColor(SK_ColorWHITE);
                    x -= SkIntToScalar(2);
                    y -= SkIntToScalar(2);
                    canvas->drawText("Hamburgefons Style", 18, x, y, paint);
                    }
                canvas->restore();
                flags = SkBlurMaskFilter::kHighQuality_BlurFlag;
                canvas->translate(350, 0);
                }
            }

    private:
        typedef SkView INHERITED;
    };

#if 0
//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new BlurView;
    }
static SkViewRegister reg(MyFactory);
#endif
